cache-page.c

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/* cache-page.c: whole-page cache wrangling functions for MMU linux
 *
 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells ([email protected])
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/module.h>
#include <asm/pgalloc.h>

/*****************************************************************************/
/*
 * DCF takes a virtual address and the page may not currently have one
 * - temporarily hijack a kmap_atomic() slot and attach the page to it
 */
void flush_dcache_page(struct page *page)
{
    unsigned long dampr2;
    void *vaddr;

    dampr2 = __get_DAMPR(2);

    vaddr = kmap_atomic_primary(page);

    frv_dcache_writeback((unsigned long) vaddr, (unsigned long) vaddr + PAGE_SIZE);

    kunmap_atomic_primary(vaddr);

    if (dampr2) {
        __set_DAMPR(2, dampr2);
        __set_IAMPR(2, dampr2);
    }

} /* end flush_dcache_page() */

EXPORT_SYMBOL(flush_dcache_page);

/*****************************************************************************/
/*
 * ICI takes a virtual address and the page may not currently have one
 * - so we temporarily attach the page to a bit of virtual space so that is can be flushed
 */
void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
                 unsigned long start, unsigned long len)
{
    unsigned long dampr2;
    void *vaddr;

    dampr2 = __get_DAMPR(2);

    vaddr = kmap_atomic_primary(page);

    start = (start & ~PAGE_MASK) | (unsigned long) vaddr;
    frv_cache_wback_inv(start, start + len);

    kunmap_atomic_primary(vaddr);

    if (dampr2) {
        __set_DAMPR(2, dampr2);
        __set_IAMPR(2, dampr2);
    }

} /* end flush_icache_user_range() */

EXPORT_SYMBOL(flush_icache_user_range);